Bifunctional xylan derivatives ( XDs) with high degree of substitution were prepared from native xylan in wheat straw,with acrylamide as the etherifying agent,alkali as the catalyst,and butanol /water mixture as the reaction system. Then,the structure of the products was characterized by means of 13C NMR. Moreover,the dynamic rheological behaviors and thermal stability of XDs and the native xylan were tested by using a parallel-plate rheometer
and a simultaneous thermal analyzer, respectively. The results show that,as compared with the native xylan,the shear-thinning phenomenon of XDs solution is significant,with relatively lower viscosity,storage modulus and loss modulus,that the storage modulus is higher than the loss modulus,and that the thermal stability of the xylan declines after the modification.